Rename your file to K4BAI.txt and it will work. I had the same problem. I sent them an email and K9PG told me to do this.
-------- Original message --------
From: John Laney <k4bai@att.net>
Date: 9/23/18 1:56 PM (GMT-05:00)
To: "kg6mc >> Bob Boroughs" <kg6mc@live.com>, secc@contesting.com, Jeff Clarke <ku8e@ku8e.com>
Subject: Log Submission for NA Sprint SSB
Don't know if any of the rest of you has had a problem using the upload